var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');


//1.修改路由(斜杠前面加 . 表示绝对路径)
var routes = require('./routes/index');

//引入setting文件
var settings = require('./setting');
//引入flash插件(自动生成时不会生成）
var flash = require('connect-flash');
//引入session会话插件（用来存放数据）
var session = require('express-session');
var  MongoStore = require('connect-mongo')(session);


var app = express();

//2. 模板引擎的设置
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

//此处设置浏览图标
app.use(favicon(path.join(__dirname, 'public', 'tu.ico')));
//app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

//使用上面所新安装的插件flash,session
app.use(flash());
app.use(session({
    //防止篡改cookie
    secret:settings.cookieSecret,
    key:settings.db,
    cookies:{maxAge:1000*60*60*24*30},
    store:new MongoStore({
        url:'mongodb://localhost/ynData'
    }),
    resave:false,
    saveUninitialized:true
}))

//在本地存储一下user，success，error这三个变量
app.use(function(req,res,next){
    res.locals.user = req.session.user;
    res.locals.success = req.flash('success').toString();
    res.locals.error = req.flash('error').toString();
    next();
})


//3.将app这个应用传入到routes函数中,二者建立起联系
routes(app);


// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
    res.render('error');
});

//4.添加启动文件
app.listen(3000,function(){
    console.log('My app is running······')
})

module.exports = app;
